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Editorial Team
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Asked: 2026-05-29T06:05:10+00:00

When we create a simple android app, we can find MainActivity.java in src/com.app.main and

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When we create a simple android app, we can find MainActivity.java in src/com.app.main and R.java in gen/com.app.main (Also, you can define another file or package name, but the format is similar). and from all the indication i found in the code, it seems that src/com.app.main && gen/com.app.main means the same package. why? IMO package is only a folder, and MainActivity.java is in the folder src/com/app/main, R.java is in the folder gen/com/app/main, obviously two different folders, and i think that two different folders mean two different package, anything wrong?

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  1. Editorial Team

    First of all, package is not a folder. Source file belongs to the package indicated by the package clause at the first line of that file. Creating folder structure that corresponds to the package structure is just a convention.

    Secondly, when mapping folders to packages folders are treated as relative to their respective base source folders. In your case there are two source folders: src for your sources and gen for generated sources, and both folders contain subfolders that correspond to the same package.

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